On 31 March 2026, Greek transmission system operator ΑΔΜΗΕ (IPTO) published contract notice DEA-42565 for the study, supply and installation of a high-voltage direct current cable system (2×500 MW) for the Corinth–Kos electrical interconnection, launching a new tender for this cable package following cancellation of the previous tender.
On 5 February 2026, the European Investment Bank and IPTO signed a financing agreement for the Dodecanese interconnection, formalising an initial €600 million loan as part of a broader €1.9 billion package to fund the Corinth–Kos HVDC cables, converter stations and associated island links, thereby securing long‑tenor debt financing to eliminate the electrical isolation of Kos, Rhodes and Karpathos.
On 22 December 2025, IPTO proceeded with a re‑launched tender for the submarine electrical cables linking Corinth with Kos, specifying a 1,290 km bidirectional HVDC cable system with 1,000 MW transmission capacity and a cable‑section budget of €1.35 billion. The tender, part of the wider Dodecanese interconnection and with bids due by 30 January 2026, aims to integrate the Dodecanese islands into the mainland transmission system and is prepared in parallel with EIB financing and grant applications for the project.
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The Corinth–Kos electrical interconnection is a domestic HVDC island-link project developed by IPTO/ADMIE (Independent Power Transmission Operator) to directly connect the Hellenic mainland at Korinthos (Corinth) with the island of Kos via submarine high-voltage direct current cables and converte...
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Corinth-Kos electrical interconnection, Corinth–Kos HVDC interconnection, Dodecanese Interconnection, IPTO Dodecanese Interconnection
By 10 December 2025, IPTO reported that the tender for the Corinth–Kos HVDC cable interconnection, originally published at the end of 2024, had been declared unsuccessful (inoperative) because no bids were submitted. The operator noted that while the tender process for the Corinth and Kos converter stations was still ongoing, the cable interconnection tender would be re‑announced, signalling the need to restart procurement for this key component of the project.
On 19 November 2025, the European Investment Bank approved an operation providing approximately €1.9 billion of financing for IPTO’s Dodecanese interconnection project, which includes the Corinth–Kos HVDC link; the package will fund, among other components, an overhead line near Corinth, converter stations in Corinth and Kos, two HVDC submarine cables between Corinth and Kos, related fibre‑optic links, and substations and cables on Kos, Rhodes and Karpathos.
IPTO/ADMIE reported that the marine surveys for the Dodecanese interconnection, which includes the HVDC Corinth–Kos electrical link via Corinth to connect Kos, Rhodes and Karpathos to the mainland grid, were completed in December 2024. These seabed investigations form a key early-development milestone for routing and designing the undersea cable system for the Corinth–Kos project and associated island connections.
On 18 November 2024, grid operator ADMIE/IPTO announced that the Corinth–Kos electrical interconnection, the first phase of the Dodecanese integration into the mainland high‑voltage system, had been selected for financing by the Islands Decarbonization Fund (also referred to as the Island Unconnection Fund), providing dedicated capital support alongside the project’s €630 million cable budget and €789.1 million converter station budget.
On 18 November 2024, IPTO/ADMIE launched the main tender for the Corinth–Kos electrical interconnection, covering the design, supply and installation of a 1,000 MW high‑voltage direct current (HVDC) system comprising two parallel 500 MW submarine cables of about 380 km and two converter stations at Corinth and Kos. The tender, with budgets of approximately €630 million for the cable systems and €789.1 million for the converter stations and a 36‑month construction period from contract signing, is the core step in integrating the Dodecanese islands into Greece’s mainland high‑voltage grid and enabling the phase‑out of local oil‑fired generation.
In December 2023, IPTO/ADMIE submitted the Environmental Assessment Study (combined Environmental Impact Assessment) for the Dodecanese Interconnection, including the Corinth–Kos HVDC link with its overhead line in Corinth, the converter stations at Corinth and Kos, and the submarine cables between them, to the Greek Ministry of Environment and Energy for approval. This submission initiates the formal environmental permitting process for the project, with approval of the environmental assessment noted as pending in subsequent 2025 disclosures and in EIB project documentation.
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